|Publication number||US8111119 B2|
|Application number||US 11/842,920|
|Publication date||Feb 7, 2012|
|Filing date||Aug 21, 2007|
|Priority date||Feb 19, 2003|
|Also published as||US8866570, US20070279165, US20120139671, US20150014192|
|Publication number||11842920, 842920, US 8111119 B2, US 8111119B2, US-B2-8111119, US8111119 B2, US8111119B2|
|Inventors||Glendell N. Gilmore|
|Original Assignee||Gilmore Glendell N|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (50), Non-Patent Citations (9), Referenced by (1), Classifications (11), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation-in-part of U.S. patent application Ser. No. 11/280,006, filed Nov. 16, 2005, now U.S. Pat. No. 7,259,647, which is a continuation of U.S. patent application Ser. No. 10/369,004, filed Feb. 19, 2003, now U.S. Pat. No. 6,977,570.
1. Field of the Invention
The present invention relates generally to reed switches and more specifically to the method of using one or more reed switches to control one or more devices.
2. Description of the Related Art
Reed switches are magnetically-operated switches, which are typically formed by a pair of spaced ferromagnetic contacts or blades, hermetically sealed in a glass capsule. In a typical application and use of a reed switch, the blades are connected to outside leads—each outside lead being part of a circuit. The exposure of the blades to a magnetic field—coming from either a permanent magnetic or electromagnetic generation—forces the blades to move, either contacting one another or moving away from one another. The contacts or blades may be normally-open or normally-closed. As used herein, in a normally-closed reed switch, the blades normally are not contacting each other but will close or contact each other when a magnetic field is present. In a normally-open reed switch, the blades normally contact each other but will open or separate when a magnetic field is present. Upon removal or shielding of the magnetic field from the reed switch, the blades of the normally-closed reed switch will separate or open whereas the blades of the normally-open reed switch will close or contact each other.
Generally, the reed switch is activated (that is, causing the ferromagnetic blade to move, be it closing the circuit or opening the circuit) via the use of a magnetic field. Such an activation allows communication to be established with a system or device. In some instances the communication may be the lack of a signal or electrical energy being returned when the reed switch opens the circuit, while in other instances, the communication may be the circuit being completed.
One recognized use of a reed switch is monitoring the “change of state” of something, for example a door or window, in security or burglar alarm systems. In such an example, a reed switch causes a circuit to be completed (i.e., closed) or broken (i.e., opened) when a window or door opens or closes. Typically, this change of condition (the opening or closing of the circuit) is automatically detected by a central alarm system or the like, indicating whether or not an unauthorized “change of state” has occurred. A typical security use of such a reed switch may be, for example, on a window or door assembly of a house or on a roll-up door assembly of a storage shed. In such situations, it is well known and understood that the central alarm system typically receives a low voltage signal passing through the reed switch to indicate one status of the door or window, and does not receive the low voltage signal from the open reed switch when the door or window is in another state.
With the use of reed switches to control a device, several design considerations must be taken into account. Reed switches are by their very nature fragile—that is, the glass capsules can break. An exacerbation of the fragile nature is the likelihood that two reed switches in too close proximity to one another may hit and break each other.
Biasing a reed switch. It has been known for many years by those skilled in the art that biasing a reed switch with a first stationary magnet may have a benefit in some instances. One such application of biasing a reed switch is seen in U.S. Pat. No. 2,877,361 to Chase, issued Mar. 10, 1959. The Chase patent teaches using the magnetic flux of a stationary biasing magnet next to a set of reed switch contacts of a stationary reed switch to bias the set of reed switch contacts to the “magnet present” closed state. The closed state remains until the magnetic flux of a second moving magnet or actuator magnet, attached to a movable part of an opening, is, present to cancel or annul the flux field of the stationary biasing magnet away from the biased reed switch contacts. This results in the reed switch contacts changing to the “magnet not present” open state even though the biasing magnet has not moved from its stationary position next to the reed switch contacts.
Thus, biasing a stationary set of reed switch contacts with an adjacent small stationary biasing magnet, having a small magnetic flux field just strong enough to bias the set of reed switch contacts to the “magnet present state,” in conjunction with a second larger magnet with a stronger magnetic flux field spaced farther away from the set of reed switch contacts is known in the prior art. When the presence of the second larger magnet's magnetic field is present on the reed switch contacts, the second larger magnet overpowers the smaller first stationary biasing magnet and the contacts change to their “magnet not present” state even though magnets are present. The second larger magnetic flux presence could be physically moved away from the set of reed switch contacts and the first stationary biasing magnet to remove the second larger magnetic flux presence from the set of reed switch contacts and biasing magnet. Alternatively, the second larger magnet could also be stationary and ferromagnetic material moved between the set of magnetically biased reed switch contacts and the second larger stationary magnet removes the second larger magnetic flux from the magnetically biased reed switch contacts to change the state of the reed switch. It is further known that a reed switch apparatus can have more than one set of reed switch contacts pre-biased by a biasing magnet.
Another technique of using a stationary biasing magnet to influence a set of reed switch contacts is taught in U.S. Pat. No. 4,943,791 to Holce et al., issued Jul. 24, 1990. A first stationary biasing magnet placed to one end of a set of reed switch contacts provides a portion of the required magnetic flux density to cause magnetic actuation or the “magnet present” state, but not enough. The remaining portion of magnetic flux density required to change the state of the reed switch contacts to the “magnet present” state is provided by a second moving magnet. By using a first stationary biasing magnet in this arrangement the reed switch contacts require less of a magnetic flux from the second moving magnet, creating a greater actuation distance to change to the “magnet present” state by the second moving magnet, resulting in a wide gap switch.
By influencing a set of reed switch contacts with a biasing magnet has shown to facilitate a certain balance between the magnetic fields of all used magnets within the equation. This balance is short lived due to constantly changing variables within the equation. The magnets, for example, lose some of their magnetic flux properties over time, resulting in inconsistent results. This inconsistency is even more evident when using not only a fixed biasing magnet, but also a fixed stationary activation magnet and controlling the magnetic field with a piece of ferromagnetic material between the fixed stationary actuation magnet and the set of reed switch contacts being biased by the fixed biasing magnet. Any inconsistency can be overcome by correctly matching all the magnets' magnetic flux properties within the equation to include a large demagnification error window graduated over time to provide a more consistent result.
Various magnetic reed switch configurations. As discussed above, a simple reed switch configuration is generally formed by one set of contacts that are part of the flexible blades within the sealed glass bulb of a reed. Other more complex configurations having more than one set of contacts exist, such as a single pole double throw switch. Following are some different combinations and configurations of magnetic reed switches illustrated schematically in
Normally Open Single Pole Single Throw Switch (N.O. SPST) (
Normally Closed Single Pole Single Throw Switch (N.C. SPST) (
Normally Open/Normally Closed Single Pole Double Throw Switch (N.O./N.C. SPDT) (
Normally Open Double Pole Single Throw Switch (N.O. DPST) (
Normally Closed Double Pole Single Throw Switch (N.C. DPST) (
Magnetic reed switches, like mechanical switches and solid state switches, utilize some sort of formed open or closed contacts in different configuration combinations held within the switch. As described above, reed switch contacts are typically encased within a sealed glass bulb filled with either a gas or vacuum-packed and typically at a different pressure than earth's atmospheric pressure to preserve the contacts from the environment. Mechanical or solid state, switches may or may not be sealed in some fashion, but do employ all the contact combinations and configurations of a reed switch.
A magnetic reed switch requires some sort of magnetic flux exposed upon the reed switch for the reed switch to change state. A mechanical or solid state switch usually requires some sort of moving mechanical interaction to change state. Some forms of a solid state switch also require power in order to change states.
Transportable storage containers. In recent years the transportable storage container industry for individual and company rental applications has grown significantly. Typically, the renter contacts the storage container company, and has a portable self-storage container delivered to the renter's location from the storage company's warehouse or holding location. The renter fills the portable container with the renter's contents. Typically, the portable container may be at the renter's location from one day to several months, during which time the portable container has no alarm and is vulnerable to thieves and/or terrorists. The portable container may be used for temporary, semi-permanent or permanent storage at the renter's location. When the container is no longer needed, it is picked up empty and returned to the storage container company's warehouse or holding area.
In other instances, after the portable storage container is filled with the renter's contents, the storage company is called to pick up the filled container and transport it to the storage company's warehouse or holding area where containers are typically stacked in multiple rows in a very large area. The containers that are filled with items do not have any type of on-board security system or location device to protect the goods inside the containers.
It would be desirable to be able to easily locate a needed specific container out of rows of hundreds of stacked transportable storage containers that all look similar at the warehouse or holding area.
A problem that exists with transportable storage containers is that the portable container's openings are not protected by a security system and the container's contents are unsecured during transportation to and from the renter's location and the entire time the container is at the renter's location, whether it is used for temporary or permanent storage. The only item that typically secures the contents of the container is some type of mechanical lock, which can be physically bypassed without anyone noticing the unauthorized intrusion.
Internal lighting would also be desirable for containers that do not get adequate light when the door is open. Moreover, internal lighting would be beneficial when there is no projected sun light, such as between sunset and sun rise. In certain instances, it would be desirable to be able to automatically control a refrigeration system housed as part of the transportable storage container depending on the condition of the container's openings.
The present invention includes a method of controlling a high voltage device via the use of a single reed switch mounted, for example, to a portion of a warehouse or storage structure. Yet another embodiment of the invention includes a method of controlling a plurality of devices with a reed switch apparatus having a plurality of reed switches. When the reed switch apparatus is exposed to a single magnetic field, the reed switches are activated. The activation of the plurality of reed switches facilitates the communication with each of the plurality of devices.
The present invention includes in one embodiment a reed switch apparatus having a plurality of reed switches which communicate with a plurality of devices. In one configuration, the reed switch apparatus has been arranged and designed such that a single magnetic field can simultaneously activate all of the plurality of reed switches. In another configuration, two or more reed switches, each acting independent of one another, are simultaneously activated by a single magnetic field. Yet another embodiment of the invention includes a method of activating a device via the use of a single reed switch mounted to a portion of a warehouse structure.
Yet another embodiment of the present invention utilizes the reed switch apparatus to provide a security system and/or locating device for transportable storage containers. This is effectively and efficiently accomplished by attaching the reed switch apparatus to the openings of the storage container. The reed switch apparatus communicates the status of an opening to a system or device by either a wired or wireless means. The reed switch apparatus can be used to report the status of the openings to an onboard system or device. Depending on the status of an opening, the reed switch apparatus can be used to perform specific control functions that are determined by the local onboard system or device at the storage container. Some of the actions preformed by the local onboard system or device could be to provide security for all openings, provide internal lighting, control refrigeration and provide a container location. By providing these local controls the transportable container would be self-sufficient providing its own control functions under all circumstances all the time. Additionally, the transportation storage container may be equipped to transmit and receive control and status information to and from a remote location.
A better understanding of the present invention can be obtained when the following detailed description of the disclosed embodiments is considered in conjunction with the following drawings, in which:
Several embodiments, not drawn to scale, are shown in
While not shown in the embodiment of
While the reed switch housing 10 shown in
Also shown in this embodiment is attachment device 20. In this embodiment, attachment device 20 comprises a mounting hole 22, which facilitates the installation of the reed switch apparatus 5. Other attachment devices 20, which should become apparent to those skilled in the art, can be used—some of which are described in the embodiments below.
In practice, the reed switch apparatus 5 can be placed in a selective location. Upon exposure of the reed switches 40 inside reed switch apparatus 5 to a magnetic field (not shown), the reed switches 40 are forced or activated (opening or closing—depending on the type of reed, switch 40 being used) being forced into the normal state. In this embodiment, each of the reed switches 40 can either complete or open a circuit, via leads 30 through a common 50 and a switch control signal 60, communicating with one of the many devices used in various industries. This communication from reed switches 40, while not shown in this embodiment can be routed to a hardwired device, sent to a control module, or sent to a device which is in wireless communication with one of the leads 30.
As another example, intended for illustrative purposes only, the reed switch apparatus 5 can include two reed switches 40—one that is normally-open and one that is normally-closed (not shown). The reed switch apparatus 5 can be placed on a window near a magnet, such that when the window is closed, the magnetic field causes both reed switches 40 to be in the activated state. In this illustration, the normally-open reed switch 40 can interface or communicate with an internal siren and the normally-closed reed switch 40 can communicate with a security system. With both reed switches 40 being activated, the security system in communication with the normally-closed reed switch 40 receives an electrical signal, while the internal siren in communication with the normally-open reed switch 40 does not receive an electrical signal. When the window is open, the magnetic field is removed from the reed switches 40 and returns the reed switches 40 to their non-normal state—in this case, the switch to the internal siren being closed and the switch to the security system being opened. The security system, in not receiving a return signal because of the open circuit, recognizes that the window is open and the siren, in receiving the electrical signal because the circuit is closed, initiates.
While several structures have been shown with reference to the embodiments of
In operation, the embodiments of the reed switch apparatus 5 described with reference to
As mentioned herein, in some embodiments the reed switches 40 in the reed switch apparatus 5 can communicate with several devices. With these embodiments, as well as others described herein, the channels of communication can be in many forms. In simpler embodiments, a direct hard wired communication channel is used where the communicative signal is sent or received directly from the leads 30 of the reed switch apparatus 5. In other embodiments, the communicative signal can be sent across a wireless connection. As one example, the wireless communication can be digital, being based upon the Institute of Electrical and Electronics Engineers 802.12 wireless standard (IEEE 802.12, 1998 Edition (ISO/IEC 8802-12:1998)) or those based upon the Bluetooth wireless standard. Other wireless communications include infrared, radio signals, and the like. In other embodiments, the channels of communication can include various combinations.
The reed switch apparatus 5, as mentioned above, can be mounted in several places—dependent on use. In
While the reed switch apparatus 5 has been described as utilizing a plurality of reed switches 40 in some embodiments, in other embodiments the reed switch apparatus 5 may include only a single reed switch 40 to activate a device adapted for use with a warehouse storage structure. In such an embodiment, the warehouse storage structure can be one of those known in the art—e.g., including, but not limited to public storage facilities, military storage warehouses, airport hangers/storage, port warehouse storage, rail warehouse storage, manufacture storage warehouses and the like. The device (in which the reed switch 40 communicates in these embodiments) can include a light, air conditioning system (HVAC), or the like. As an illustrative example and with general reference to the embodiment in
With the use of such an embodiment, electrical costs can be saved. For example, once again with general reference to the embodiment in
As shown in
A reed switch apparatus 5, preferably a multi-contact reed switch apparatus, and an actuation magnet 220 are preferably attached at the opening(s) 202 of the transportable storage container 200 in one of the manners previously described. The reed switch apparatus 5 communicates the status of the opening 202 to one or more systems or devices by either a wireless or wired means.
Still referring to
The controller 804 at the transportable storage container 200 could be powered by a battery (preferably charged by a plugged-in transformer or a solar panel 240) or a second external battery source. The container's openings could be armed and disarmed by a two-way wireless key-bob that would also alert the renter if an opening has been violated from afar, much like a two-way communication car alarm system. Alternatively, a standard keypad to arm/disarm and provide all local interaction with the controller could be used.
When the portable storage container 200 is located at a storage warehouse or holding area, the onboard GPS device 803 could also communicate the status of the reed switch apparatus 5 that is attached to the opening 202, or the status of the locking device 210 on the opening, to a remote device or system 270 (
It is to be understood that this concept of utilizing the reed switch apparatus 5 with transportable containers can also be used to improve homeland security. By using the reed switch apparatus 5 on a storage cargo container's doors 202 that are connected to a container's local GPS device or system 803 at the container 200 to indicate via satellite to a remote device or system 270 if the container's doors 202 had been opened during sea, truck or rail transportation between points A and B would insure the container 200 had not been compromised during transportation. If the container's doors 202 that are being protected by the reed switch apparatus 5 had been compromised during transportation, the container's local GPS device 803 would immediately transmit to the remote device or system 270 which container 200 had been compromised, the time it happened, where the container 200 is located and what opening 202 on the container 200 was opened. Using the reed switch apparatus 5 on a container 200 to monitor the openings 202 would be a much more dependable and reliable means over a mechanical lock or tag that is being used today to secure a transportable container. The reed switch apparatus 5 would insure that a container 200 had not been compromised during transportation or temporary storage by a thief or terrorist.
As shown and discussed with reference to several of the embodiments described herein, reed switch apparatus 5 can be seen as a control system, arranged and designed to control a plurality of devices or systems. A plurality of the reed switches 40 in a reed switch apparatus 5 lie in very close proximity to one another such that the reed switches 40 can be activated simultaneously via exposure of the reed switch apparatus 5 to a single magnetic field. Thus, the reed switch apparatus 5 advantageously allows a simultaneous establishment of communication with multiple devices. Additionally, with other embodiments, the reed switch apparatus 5 can utilize one or more reed switches 40 to activate one or more devices, adapted for use with a warehouse storage structure—e.g., including, but not limited to lights, air conditioning systems, and the like.
It is to be understood that the reed switch could be biased with a biasing magnet as discussed above in the Background section.
Alternatively or additionally, it is further to be understood that the reed switches used in the present invention could comprise various combinations and configurations as, for example, the configurations discussed in the Background section and illustrated in
In certain embodiments of the present invention it may be desirable to have a high voltage control module sense circuit apparatus 980, as generally depicted in
It is to be expressly understood that while the reed switch apparatus 5 has been illustrated in several embodiments with regards to specific uses, it can be utilized in other settings to the extent foreseeable. For example, the reed switch apparatus 5 could be utilized next to a window. As such, the foregoing disclosure and description of the invention are only illustrative and explanatory thereof. Various changes in the details of the illustrated apparatus and construction and method of operation may be made to the extent foreseeable without departing from the spirit of the invention.
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|Cooperative Classification||Y10T29/49764, H01H36/0046, B65D25/02, H01H1/66, B65D88/00, Y10T29/49826, H01H36/0006|
|European Classification||H01H36/00B8, H01H36/00B|